BC-367 / BC-667 - RC-99 questions

Radio Telephone and Telegraph Transmitting and Receiving Equipment
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artillerydan
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BC-367 / BC-667 - RC-99 questions

Post by artillerydan » Tue Sep 19, 2017 8:44 pm

Trying to understand the normal application for the RC-99 set up. Does this work with everything....SCR-508... or???
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Re: BC-367 / BC-667 - RC-99 questions

Post by DDTrustee » Wed Sep 20, 2017 12:30 am

Hey Dan:
The RC99 is an outboard audio amplifier system used with th early 620 radio sets in armored vehicles. The RC99 consists of either the BC367 or the BC667 which are the 12 volt and 24 volt, respectfully, audio amplifier systems (boxes) that run the intercom mics and headphones. If the later SCR508 set is installed the audio amplifier system in the radio set could operate the intercom audio equipment when the radio was turned on and the RC99 (with the BC367 or BC667) was unnecessary. The nice thing about the early radio set up with 620 radio on the FT250 mount and the RC99 audio set is that you did not have to have a working radio in order to have a functional intercom amplifiers system. You could turn the switch on the RC99 to the ON position and the intercom in the armored vehicle would work effectively. The RC99 manual shows the different circuitry for the either or installation of the early and late radio with the RC99. Note also that the radio requires a lot more current to operate than the RC99 which can be a battery buster if the vehicle engine is not running and the intercom is in use. Its also easy to turn a 367 into a 667 with a little wiring change and new dynamotor.....works in either direction.
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Re: BC-367 / BC-667 - RC-99 questions

Post by wa5cab » Fri Sep 22, 2017 4:05 pm

Also, if the vehicle had an early SCR-528, it included a BC-605 interphone amp. So the BC-367 wouldn't have been used in those installations, either.

One thing that you do not want to do is to plug into the same FT-237 mount a late BC-604 (or an early one with the "M" suffix and all of the MWO's) and a BC-605 "just for looks".
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